Dynamic Response of Conical Shell Structures subjected to Pulse Pressure

2009 ◽  
Author(s):  
R.J. Mania ◽  
K. Kowal-Michalska
Keyword(s):  
Dynamic Response ◽  
Pulse Pressure ◽  
Conical Shell ◽  
Shell Structures

Impulsive Forming of Shell Structures With Apertures

2003 ◽  
Author(s):  
V. Sabelkin
Keyword(s):  
Dynamic Response ◽  
High Explosive ◽  
Impulsive Loading ◽  
Shell Structures ◽  
Plastic Properties ◽  
Aperture Diameter ◽  
Jet Engine ◽  
Explosive Charges ◽  
Explosive Forming ◽  
Static And Dynamic Loading

Different modern shell structures are exposed to impulsive loading very often. Some of them may have different imperfections such as apertures, welds, and irregular thickness. These structures can be made by static or impulsive loading. To know fractureless dynamic response of shell structures with apertures is important in many cases, especially for forming processes, because of the first appeared fracture can extend through a shell blank especially if material is brittle with low plastic properties. The tooling for impact and static loading of flat and shell structures was developed. Dynamic response of shell structures with unsupported apertures on internal impulsive loading by point high explosive charges is described. Strain state of shaped shell structures with apertures after explosive forming is shown. The limit aperture diameter for dynamic fractureless response is determined. Distributions of strain intensities on a sample cross section for different aperture diameters, static and dynamic loading are shown. Different jet engine parts were made using developed technology.

Compromise: An Effective Approach for Designing Composite Conical Shell Structures

1990 ◽  
Vol 112 (3) ◽  
pp. 362-368 ◽  
Author(s):  
W. J. Fuchs ◽  
H. M. Karandikar ◽  
F. Mistree ◽  
H. A. Eschenauer
Keyword(s):  
Conical Shell ◽  
Composite Structures ◽  
Composite Laminate ◽  
Fiber Composite ◽  
Shell Structures ◽  
Preliminary Design ◽  
Fiber Reinforced ◽  
Membrane Theory ◽  
Minimal Weight ◽  
Made In

The layout of fiber composite structures compared to that of structures made from conventional homogeneous isotropic materials is far more difficult, because a fiber composite (laminate) is built up of several unidirectional layers (UD-layers) with fibers set at different angles. A contribution to the structural analysis and preliminary design of a fiber-reinforced conical shell is made in this paper. The equations of the membrane theory are used for analyzing the shell behavior. The design, with the objective of obtaining minimal deformation at minimal weight, subject to a set of failure constraints, is achieved by formulating and solving a compromise Decision Support Problem. Some designs of a fiber reinforced conical shell subjected to pressure load and temperature are presented.

Micro-Signals and Modal Potentials of Nonlinear Deep and Shallow Conical Shells

2002 ◽  
Author(s):  
W. K. Chai ◽  
P. Smithmaitrie ◽  
H. S. Tzou
Keyword(s):  
Smart Materials ◽  
Conical Shell ◽  
Polyvinylidene Fluoride ◽  
Flexible Structures ◽  
Distributed Sensing ◽  
Shell Structures ◽  
Dynamic State ◽  
Toroidal Shell ◽  
Strain Component ◽  
Conical Shells

Conventional sensors, such as proximeters and accelerometers, are add-on devices usually adding additional weights to structures and machines. Health monitoring of flexible structures by electroactive smart materials has been investigated over the years. Thin-film piezoelectric material, e.g., polyvinylidene fluoride (PVDF) polymeric material, is a lightweight and dynamic sensitive material appearing to be a perfect candidate in monitoring structure’s dynamic state and health status of flexible shell structures with complex geometries. The complexity of shell structures has thwarted the progress in studying the distributed sensing of shell structures. Linear distributed sensing of various structures have been studied, like beam, plate, cylindrical shell, conical shell, spherical shell, paraboloidal shell and toroidal shell. However, distributed sensing control of nonlinear shell structures has not been carried out rigorously. This study is to present the microscopic signals, modal voltages and distributed micro-sensing components of truncated nonlinear conical shells laminated with distributed infinitesimal piezoelectric neurons. Signal generation of distributed neuron sensors laminated on conical shells is defined first. The dynamic signal of truncated nonlinear conical shell consists of microscopic linear and nonlinear membrane strain components and linear bending strain component based on the von Karman geometric nonlinearity. Micro-signals, modal voltages and distributed sensing components of two different truncated nonlinear conical shells are investigated and their sensitivities discussed.

Dynamic response of cylindrical shell structures subjected to underwater explosion

2009 ◽  
Vol 36 (8) ◽  
pp. 564-577 ◽  
Author(s):  
C.F. Hung ◽  
B.J. Lin ◽  
J.J. Hwang-Fuu ◽  
P.Y. Hsu
Keyword(s):  
Cylindrical Shell ◽  
Dynamic Response ◽  
Underwater Explosion ◽  
Shell Structures
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